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Coatings for iCARe®

Properties

Electrical steel varnishes for non-oriented grades are designed to enhance the behaviour of fully processed electrical steels. Their main purpose is to provide inter-laminar insulation and to improve the punchability of these steels. Each type has its own specific properties, such as insulation level, punchability effect, corrosion protection, temperature resistance and weldability; hence it is material use that determines the optimum choice of varnish. All varnishes have been selected and developed to be environmentally friendly: they are hydro-soluble and chromium-free.

Advantages

The C3-type varnish is based on synthetic resins, resulting in a product with excellent lubricating properties for the punching process: the coated sheet can be punched without the need for additional lubricant. The resin’s chemical composition yields special advantages such as high elasticity and very strong adhesion. It is particularly recommended for automatic stacking processes. Typical gauges for automotive applications range from 1 to 2 µm per side. A coating thickness of less than 1 µm offers the additional advantage of excellent weldability. The C3 varnish is available on request.

The C5-type varnish is a pigmented varnish, made with thermo-stable resins, mineral products and pigments. For the EC-5-N varnish, the type of mineral products and the amount used have been selected to obtain a coating with excellent temperature resistance during prolonged thermal treatments. This is of particular interest where stress-relief annealing is required after punching. Additionally, the mineral part of the coating provides high thermal conductivity. The combination of resins and mineral products achieves a good compromise between corrosion protection and weldability. The EC-5-P has an increased amount of organic components compared to the EC-5-N, in order to achieve a better punchability, whilst maintaining a good weldability. The standard gauge range is from 0.5 to 1.5 µm per side.

Applications

These coatings are used for fully processed grades for hybrid and electric traction machines and compressors. For alternators, uncoated solutions can be used.

Recommendations for use

The raw materials used in these coatings have a chemical composition – both in the liquid and cured varnish state – which does not require specific protective measures during the processing of the coated steels or during use in a given application.

Brand correspondence

  EN 10342:2005 ASTM A976:2003 IEC/CEI 60404-1-1:2004 ArcelorMittal code
C3 EC-3 C-3 EC-3 S
C5 EC-5-P C-5 EC-5-P T
C5 EC-5-N C-5 EC-5-N G

Coating properties

Designation C3* C5
Chemical composition Organic (synthetic resin)

Inorganic (minerals, pigments)

Organic (synthetic resin)

Colour Gold Grey
ArcelorMittal code S11 T11 G11
Gauge (µm/side) 0.5 to 1.5 0.5 to 1.5
Typical insulation resistance (Ω.cm2/side) 10 10
Temperature resistance (°C)
Continuous/Intermittent
180/600 210/260 250/850
Main properties Punchability Punchability Heat resistance

Insulation resistance measurement: Franklin test according to the standard EN 60404-11:2013.

Continuous temperature resistance according to the standard IEC/CEI 60404-12:1992.

*C3 varnish is available on request.

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